Group 1 - In the past month (from November 17 to December 16), 31 companies listed on the Beijing Stock Exchange (BSE) were investigated by institutions, with Naconor being the most notable, receiving attention from 91 institutions [1][2] - The types of institutions conducting the research included 31 brokerages, 17 funds, 12 private equity firms, 5 insurance companies, and 4 overseas institutions [1] - The companies that received the most institutional attention, following Naconor, were Xingtum Control, Rongyi Precision, and Kaiter Co., with 55, 40, and 37 institutions participating in their investigations, respectively [1] Group 2 - The most frequently investigated companies included Rongyi Precision, Xic Magnetic Technology, and Haosheng Electronics, each receiving two rounds of institutional research [2] - On average, the companies that were investigated saw a decline of 3.91% in their stock prices over the month, with eight companies experiencing price increases, notably Xingtum Control (up 23.55%), Tianrun Technology (up 20.19%), and Kolon New Materials (up 6.73%) [2] - The average market capitalization of all companies on the BSE was 3.071 billion yuan, while the average market capitalization of the companies that were investigated was 3.746 billion yuan, with Xingtum Control, Development Technology, and Naconor leading in market value [2] Group 3 - A detailed list of companies investigated includes Naconor (91 institutions, -11.53% price change), Xingtum Control (55 institutions, +23.55%), Rongyi Precision (40 institutions, -19.47%), and Kaiter Co. (37 institutions, -8.50%) [2][3] - Other notable companies include Tai Kai Ying (32 institutions, -2.70%), Zhu Lao Liu (18 institutions, +2.16%), and Kolon New Materials (15 institutions, +6.73%) [2][3] - The data indicates a diverse representation across 16 industries, with mechanical equipment, electric power equipment, and basic chemicals being the most represented sectors [1]